FOXBOROUGH, Mass. — Tom Brady is back at practice one day after hurting his knee.

The New England Patriots quarterback is taking part in the third day of joint practices with the Tampa Bay Buccaneers. It isn’t known if he’ll play Friday night when the teams meet in an exhibition game.

Brady jogged from sideline to sideline with his teammates at the start of practice.

He sprained his left knee about midway through Wednesday’s practice when Tampa Bay defensive end Adrian Clayborn knocked New England left tackle Nate Solder into him. Brady fell down and left the field briefly. He returned for several more plays before walking off under his own power.

In his absence, Ryan Mallett played with the first offensive unit and Tim Tebow quarterbacked the second team.